The artist's impression of USAF's top secret hypersonic "Mayhem" bomber concept. (Image: Popular mechanics)
Rotation Detonation Rocket Engine. Or simply RDRE engine is the next generation rocket system. The big difference between regular rocket engines is that RDRE engine uses screw-shaped burning structure. The simplest way to make an RDRE engine is to make a screw-looking structure in the walls of the combustion chamber.
The RDRE engine uses less fuel than a regular rocket engine. And that means it's an excellent tool for moon travel. But the RDRE engine can make much more than just transit people between the Moon and earth by using moon shuttles. The RDRE engine can connect with large-size hypersonic aircraft.
When that hypersonic aircraft starts to make a ballistic jump above the atmosphere. It can turn to use the RDRE engine when it reaches space. That makes it possible to create a real space shuttle that can operate from regular airfields. And that system can make futuristic travel to the moon from regular airports possible.
But that kind of engine combination can make things like "Mayhem" hypersonic bombers more advanced and more deadly than ever before. The ability to connect rocket engines to hypersonic aircraft is always an interesting thing. That kind of system can make it possible to launch satellites. And the same system can also use in space fighters.
Researchers are interested in scramjet engines because they use atmospheric oxygen. That gives more space for fuel. And if the scramjet has a flap at the front of it. And internal oxygen tanks can turn into a rocket. This engine system allows the craft to operate at the orbital trajectory or travel to the moon.
The RDRE engine could connect with scramjet- or ramjet engines. The idea is that at the front of the engine is the flap that is closed when the aircraft cannot use air from the atmosphere.
Then the system can turn to use internal oxygen that makes the same aircraft or shuttle able to operate in the atmosphere and space. The system can be more powerful and multi-use than ever before. The screw-looking structure in the ramjet- or scramjet engine will also allow them to fill the chamber more effectively.
The flap scramjet makes it possible to create hypersonic aircraft that don't need any compressors or regular jet engines for lift-off. At the beginning of the flight, the system uses flap scramjets in rocket mode. When the aircraft's speed is high enough the system turns to use the oxygen from the atmosphere. And if will turn to fly to an orbital trajectory. It turns back to use its engines in rocket mode.
https://afresearchlab.com/technology/rotating-detonation-rocket-engines-rdre/
https://www.popularmechanics.com/military/aviation/a42589676/air-forces-secret-hypersonic-bomber-project-mayhem-updates/
https://scitechdaily.com/rotating-detonation-rocket-engine-nasas-revolutionary-propulsion-design-for-deep-space-missions/
https://en.wikipedia.org/wiki/Rotating_detonation_engine
See also:
Scramjet
Ramjet
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